Cruciform Tower Post-Tensioning Reduces Connection Failure Points
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Solution Overview
Problem
Existing wind turbine tower assembly methods require numerous connections that can be potential failure points and are time-consuming, especially when using prefabricated wall parts that need to form polygonal rings or monolithic sections within transportation constraints.
Innovation Solution
The use of post-tensioning cables within longitudinal sections of the tower, with varying cross-sectional geometries and precast components, reduces the number of connections and field casting, while maintaining structural integrity through circumferential compressive forces generated by anchored strands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple prefabricated wall parts are assembled side by side to form polygonal rings, then the tower can resist great forces in horizontal and vertical directions, but the number of connections increases significantly creating potential failure points and requiring additional assembly time
Solution Approach 1:
The tower is divided into discrete prefabricated wall parts that can be manufactured separately and assembled on-site. Each wall part is a complete structural unit that can be handled and positioned independently, allowing parallel manufacturing and streamlined assembly processes.
Solution Approach 2:
Multiple wall parts are combined to form complete tower levels, with the invention specifically merging two wall parts per level to form a circular tower section. This reduction from three or more segments to just two segments per level directly reduces the number of connections required while maintaining structural integrity and force resistance capabilities.
2Strength
If multiple connections are implemented for each mast level to ensure structural integrity, then the tower can resist great forces, but the number of potential failure points increases
Solution Approach 1:
By merging the tower structure into just two wall parts per level, the number of connections is halved compared to using three or more segments. Each connection point represents a potential failure point, so reducing from 9+ connections to approximately 6 connections per level (3 horizontal + 3 vertical) directly improves reliability while maintaining structural integrity through fewer, but equally robust, connection points.
3Area of stationary object
If monolithic elements are used to expand cross-section footprint within transportation constraints, then the tower can achieve larger dimensions, but the element size is limited by transport box dimensions
Solution Approach 1:
The tower cross-section is segmented into two large prefabricated wall parts instead of requiring a single monolithic element. This segmentation allows each part to be sized within transportation constraints while the combined footprint of both parts achieves the desired large cross-sectional dimensions for structural stability and force resistance.
Solution Approach 2:
The solution transitions from a single-dimension constraint (monolithic element size limited by transport box) to a two-dimension solution (two smaller elements that fit in transport but combine to create larger footprint when assembled). By utilizing the assembly dimension, the tower achieves larger cross-sectional area without requiring individually larger transportable elements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the efficiency and reliability of tower assembly by minimizing potential failure points and reducing assembly time, while allowing for taller, more structurally sound towers with reduced long-term fatigue risk.
Implementation Method 1
The use of post-tensioning cables within longitudinal sections of the tower, with varying cross-sectional geometries and precast components, reduces the number of connections and field casting, while maintaining structural integrity through circumferential compressive forces generated by anchored strands.
Data Source
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AI summary
A tower includes a plurality of stacked sections extending in a longitudinal direction from a base section to a top section, at least one of the stacked sections including a first block and a second block joined together, the first block and the second block having interlocking portions such that a first portion of the first block is located above a first portion of the second block in the longitudinal direction.